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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b9e2def44c66793903eb613121726f4e79f1d95db10d73958e639f80cd831da' 
  AND token = '2hdGKD56XHczkjJaIxvx2UaNJkoMFC3C4swTQXCy8dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}